Found on Dog's Mercury (Mercurialis perennis)
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Thanks charlieb. What are the key features that suggest this species?
Plenty of info here, if you haven't already seen this.
Being found on Dog's Mercury seems to be one feature.
(Not an expert though.)
Seems to suggest it is pretty distinctive so safe to ID from a photo.
Quoted here http://www.ispotnature.org/node/392639
THREE MARINE PROJECTS
Lat/Lng: 51.255, -0.3104
OS grid ref: TQ180520